Preserve interlaced scan type in label and MKV output
Interlacing is detected upstream (PAL DVD -> R576i) but was dropped in two places: the video label hardcoded a 'p' suffix, and the muxer never wrote any scan-type flag, so MediaInfo inferred progressive and reported 576p for a 576i source. - Add Resolution::is_interlaced() for the R*i variants. - generate_video_label now branches i/p for the heights that can be interlaced (1080, 576, 480) instead of always emitting 'p'. - MkvTrack carries interlaced + field_order; the video serializer emits FlagInterlaced (0x9A; 1=interlaced, 2=progressive) and, for interlaced content, FieldOrder (0x9D) - bottom-field-first for PAL 576i, top-field-first otherwise. Adds the EBML constants.
This commit is contained in:
Matthew Jackson
@@ -31,6 +31,11 @@ pub struct MkvTrack {
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pub colour_transfer: u8, // TransferCharacteristics (16=smpte2084/PQ)
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pub colour_primaries: u8, // Primaries (9=bt2020)
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pub colour_range: u8, // Range (1=tv/limited)
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// Scan type. `interlaced` drives FlagInterlaced (0x9A): true → 1
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// (interlaced), false → 2 (progressive). `field_order` (0x9D) is only
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// meaningful when interlaced; `FIELD_ORDER_UNDETERMINED` omits it.
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pub interlaced: bool,
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pub field_order: u8,
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// Audio-specific
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pub sample_rate: f64,
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pub channels: u8,
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@@ -125,6 +130,18 @@ impl MkvTrack {
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colour_transfer: transfer,
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colour_primaries: primaries,
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colour_range: range,
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interlaced: v.resolution.is_interlaced(),
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// PAL DVD (576i) is bottom-field-first; NTSC DVD (480i) is
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// top-field-first. HD interlaced (1080i) is top-field-first.
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// Progressive content leaves the field order undetermined.
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field_order: if v.resolution.is_interlaced() {
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match v.resolution {
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Resolution::R576i => ebml::FIELD_ORDER_BFF,
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_ => ebml::FIELD_ORDER_TFF,
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}
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} else {
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ebml::FIELD_ORDER_UNDETERMINED
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},
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sample_rate: 0.0,
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channels: 0,
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bit_depth: 0,
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@@ -195,6 +212,8 @@ impl MkvTrack {
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colour_transfer: 0,
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colour_primaries: 0,
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colour_range: 0,
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interlaced: false,
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field_order: ebml::FIELD_ORDER_UNDETERMINED,
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sample_rate: sr,
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channels: ch,
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bit_depth: 0,
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@@ -228,6 +247,8 @@ impl MkvTrack {
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colour_transfer: 0,
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colour_primaries: 0,
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colour_range: 0,
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interlaced: false,
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field_order: ebml::FIELD_ORDER_UNDETERMINED,
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sample_rate: 0.0,
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channels: 0,
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bit_depth: 0,
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@@ -666,6 +687,21 @@ impl<W: Write + Seek> MkvMuxer<W> {
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let vid_pos = ebml::start_master(&mut writer, ebml::VIDEO)?;
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ebml::write_uint(&mut writer, ebml::PIXEL_WIDTH, track.pixel_width as u64)?;
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ebml::write_uint(&mut writer, ebml::PIXEL_HEIGHT, track.pixel_height as u64)?;
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// Scan type. FlagInterlaced: 1 = interlaced, 2 = progressive.
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// FieldOrder is only written for interlaced content with a
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// determined order (TFF=0/2/6/14, BFF=1/9/13...).
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ebml::write_uint(
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&mut writer,
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ebml::FLAG_INTERLACED,
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if track.interlaced {
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ebml::INTERLACED_INTERLACED
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} else {
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ebml::INTERLACED_PROGRESSIVE
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},
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)?;
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if track.interlaced && track.field_order != ebml::FIELD_ORDER_UNDETERMINED {
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ebml::write_uint(&mut writer, ebml::FIELD_ORDER, track.field_order as u64)?;
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}
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if track.display_width > 0 && track.display_height > 0 {
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ebml::write_uint(&mut writer, ebml::DISPLAY_WIDTH, track.display_width as u64)?;
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ebml::write_uint(
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@@ -1161,6 +1197,8 @@ mod tests {
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colour_transfer: 0,
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colour_primaries: 0,
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colour_range: 0,
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interlaced: false,
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field_order: ebml::FIELD_ORDER_UNDETERMINED,
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sample_rate: 0.0,
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channels: 0,
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bit_depth: 0,
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@@ -1186,6 +1224,8 @@ mod tests {
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colour_transfer: 0,
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colour_primaries: 0,
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colour_range: 0,
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interlaced: false,
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field_order: ebml::FIELD_ORDER_UNDETERMINED,
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sample_rate: 48000.0,
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channels: 6,
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bit_depth: 0,
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@@ -2944,6 +2984,52 @@ mod tests {
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);
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}
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#[test]
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fn video_emits_flag_interlaced_and_field_order() {
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// An interlaced (576i PAL) track must emit FlagInterlaced=1 and
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// FieldOrder=9 (bottom-field-first). A progressive track must emit
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// FlagInterlaced=2 and NO FieldOrder.
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let mut interlaced = make_video_track();
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interlaced.interlaced = true;
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interlaced.field_order = ebml::FIELD_ORDER_BFF;
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let muxer = MkvMuxer::new(Cursor::new(Vec::new()), &[interlaced], None, 0.0, &[]).unwrap();
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let data = muxer.writer.into_inner();
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let fi = find_id(&data, ebml::FLAG_INTERLACED).expect("FlagInterlaced present");
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// [id=0x9A][size=0x81][value]
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assert_eq!(
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data[fi + 2],
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ebml::INTERLACED_INTERLACED as u8,
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"FlagInterlaced must be 1 (interlaced)"
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);
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let fo = find_id(&data, ebml::FIELD_ORDER).expect("FieldOrder present");
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assert_eq!(
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data[fo + 2],
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ebml::FIELD_ORDER_BFF,
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"FieldOrder must be 9 (bottom-field-first) for PAL DVD"
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);
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// Progressive track: FlagInterlaced=2, no FieldOrder.
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let muxer = MkvMuxer::new(
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Cursor::new(Vec::new()),
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&[make_video_track()],
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None,
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0.0,
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&[],
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)
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.unwrap();
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let data = muxer.writer.into_inner();
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let fi = find_id(&data, ebml::FLAG_INTERLACED).expect("FlagInterlaced present");
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assert_eq!(
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data[fi + 2],
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ebml::INTERLACED_PROGRESSIVE as u8,
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"FlagInterlaced must be 2 (progressive)"
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);
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assert!(
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find_id(&data, ebml::FIELD_ORDER).is_none(),
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"no FieldOrder for progressive content"
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);
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}
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#[test]
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fn dolby_vision_track_emits_block_addition_mapping() {
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// A DV track (dv_config set) must emit BlockAdditionMapping (0x41E4)
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